Search quality rater (assessor)

Who are search quality raters

Search quality raters (assessors) are real people hired by search engines (Google, Yandex, Bing) to manually evaluate the quality of search results. They do not directly affect rankings. Their job is to rate pages according to different criteria (usefulness, authority, usability). These ratings are then used as the 'gold standard' to train neural networks: algorithms learn to mimic the rater's decisions.

Google has thousands of raters worldwide. They work via a special platform (RaterHub). Raters do not write code or control algorithms — they only judge how good a page is for a user according to set criteria.

How ratings work

Typical workflow:

1. The search engine generates a set of queries and takes real SERPs.
2. The rater receives a task: for each result, rate relevance, content quality, E-E-A-T (Experience, Expertise, Authoritativeness, Trustworthiness), and page usability.
3. The rater assigns a score (e.g., from 'Low quality' to 'High quality').
4. Ratings are collected into a dataset and used to train algorithms — for example, RankBrain learns to predict the rater's score based on behavioral factors and page signals.
5. If the algorithm makes a mistake (gives high quality where the rater gave low), its weights are adjusted.

Thus, raters shape the 'taste' of the search engine: what is good and what is bad. If you want high rankings, your site must appeal to raters (i.e., comply with the QRG).

Quality Rater Guidelines (QRG)

Google publishes its rater instructions — a document over 170 pages long, known as the Search Quality Rater Guidelines (QRG). Although written for raters, SEO professionals use it as a guide to creating high-quality content. Main sections of the QRG:

• Page Quality (PQ) — overall page rating from lowest to highest.
• E-E-A-T — Experience, Expertise, Authoritativeness, Trustworthiness.
• Your Money or Your Life (YMYL) — topics that can affect health, finances, or user safety. These have higher requirements.
• Needs Met — how well the page satisfies the user's query.
• Mobile friendliness, security, absence of spam.

How to prepare your site for raters

• Content: write useful, thorough articles with evidence of expertise (bylines, references, update dates).
• E-E-A-T: add 'About us', 'Authors' pages, reviews, case studies, awards, external mentions.
• For YMYL sites (health, finance, law), always include author qualifications, licenses, contacts.
• Technical quality: fast loading, responsiveness, HTTPS, no intrusive ads.
• Avoid spam: over-optimized anchors, doorway pages, auto-generated text.

The QRG is not a checklist for immediate ranking improvement, but a philosophy of building a site for people. By following it, you increase the chances of good rater ratings, and thus algorithmic trust.